<nz-tooltip
  *ngIf="nzTipFormatter !== null && nzTooltipVisible !== 'never'"
  [nzTitle]="tooltipTitle"
  [nzTrigger]="null">
  <div nz-tooltip class="ant-slider-handle" [ngStyle]="style"></div>
</nz-tooltip>
<div *ngIf="nzTipFormatter === null || nzTooltipVisible === 'never'" class="ant-slider-handle" [ngStyle]="style"></div>
